I bought MS Streets and Trips with Pocket Streets included and installed the pocket Streets on iPAQ H5550. Based on the info I have, the GPS Interface to the Pocket Streets is through a Serial COM port. If I can get Lat/Log data from Onstar in-vehicle hardware to the iPAQ H5550, is there a software API available on Pocket Streets to accept the GPS Lat/Log data instead of using a serial COM port?